Improvement in let-off mechanisms for looms



G. P. ROSE, A. CARTWRIGHT 81. B. S. ROSE.

Let-off Mecha nism for Looms.

Patented March-30,1875.

Q70 f I $23 THE GRAPHIC 0.PHOTO -L|TH.39 841 PARK PLMIEJLY.

Unrrnn STATES ATENT Enron.

GEORGE P. ROSE AND ABEL OARTWRIGHT, OF SLOCUMVILLE, AND BENONI S. ROSE,OF LAFAYETTE, RHODE ISLAND.

IMPROVEMENT IN LET-OFF MECHANISMS FOR LOOMS.

Specification forming part of Letters Patent No. 1 61,443, dated March30, 1875 application filed February 1, 1875.

To all whom it may concern:

Be it known that we, GEORGE P. Rosa and ABEL CARTWRIGHT, of Slocumville,and BE- NONI S. RosE, of Lafayette, in the county of Washington andState of Rhode Island, have invented certain Improvements in Looms 5 anddo hereby declare the following to be a full and correct descriptionthereof, reference being had tothe accompanying drawings, making part ofthis specification, and to the letters and numbers of reference markedthereon,-

similar letters and numbers being used in all the figures to denote thesame part.

In these drawings, Figure 1 is a top view, Fig. 2 is an end view of thebeam B and standard 0, showing the connections with the other parts ofthe loom; and Fig. 3 is a modification of the improvements.

Our invention relates to a new and novel mode of arranging, combining,and making let-off motions for looms and its object is to give a uniformtension to the warp, so that the decrease in the amount-of yarn on thebeam shall not increase the strain on the warp; and consists incombining with the frictionstrap on the head of the beam an arm with aroller or pad, bearing against the yarn on the beam, thereby regulatingthe tension of the strap as the size of the beam decreases. The abovecombination, operating with the sword of the lathe to hold the warp firmagainst the beat-up, and in arranging a rod and cam, so as to relievethe beam of the friction-strap when necessary; and, lastly, in anadjustable standard with self-adjusting friction-rolls to hold theweight of the yarn-beam.

A is the frame; B, the yarn-beam, hung in bearings in the ends of theframe. A standard, C, is secured to the back girt S. Two knee-levers, ab, are pivoted to this standard, to which levers the outer and innerends of the friction-strap D are respectively attached. A spiral spring,0, is placed on the rod that connects the outer end of the strap to thelever a between the lever and a screw-nut, 0, used to regulate thetension of the frictionstrap. A rocker-shaft, F, is supported inbearings on the inside of the back girt S, with an upright arm, g, onits inner end, to Which a roller or pad, G, is attached on its upperend, so as to rest against the yarn on the beam. On the other end of therock-shaft F a curved arm or cam, h, is fastened, so adjusted, that itshall press against the lower arm of the lever b. A rod, T, connects thelower end of the lever on with the lathe-sword M, through which itslides freely up to the head of the rod, the length of the rod beingmade adjustable by means of a screw-thread and nuts on the other end. Acam, f, is hung on a pivot to the lower end of the standard 0, and whenturned in it holds the lower end of lever on in position to keep thetension on the friction-strap; but when turned back the strap isslaokened and the yarn-beam can be easily turned in either direction. Anadjustable standard, L, is secured by a bolt, 0, through a slot near itslower end, to the standard O on back girt S. A self-adj usting framewith two friction-rolls, i i, is pivoted to the top of this standard totake the weight of the yarn-beam off of its bearings, and to relievethem of the shock and strain that would otherwise be thrown on them whenthe frictionstrap is tightened up by the lathe beating up the filling,especially in weaving heavy goods. The inner end of the frictionstrapmay be fastened directly to the curved arm or cam h, thereby dispensingwith the lever b.

The operation is as follows: When the yarnbeam is full and the warp hasthe greatest leverage over it, the roller resting on it, holds therocker-shaft over, so that the cam, pressing against the lower end ofthe lever b, draws on and tightens the friction-strap, so that the beamshall not turn too easily; but, as the quantity of yarn on the beamdiminishes, the roller falls in and allows the rocker-shaft to turn thecam from the lever b, and the tension on the friction-strap is therebylessened in proportion asthe yarn diminishes, thus making the tensionthe same from beginning to end. The operation of the rod T is to draw onthe lowerv end of the lever a, and this tightens the frictionstrap, whenthe lathe comes forward to beat in the filling, and immediately lettingit back to its usual tension, as the lathe returns, and the harnessesform the shed.

It will be perceived that the effect of the position of the roller Galso extends to the regulating of the firmness with which the warp isheld when the lathe beats up, thereby producing a great uniformity inthe laying up of the filling. Instead of connecting the rod T with swordM, it may be operated by a cam on a shaft of the loom.

Having thus described our improvements, what we claim as our inventionis 1. The combination of the arm g, rock-shaft F, cam h, lever b, strapD, and lever a, operated by the lay or any moving part of the loom, withthe beam B, all operating together, substantially as and for thepurposes set forth.

2. The combination of the beam B, arm 9, cam h, lever 11, strap 1), andlever a with the cam f, all operating together, substantially as and forthe purposes described.

3. The combination of the cam f, lever a, and friction-strap D with thebeam B, substantially as and for the purpose specified.

4. The combination of the adjustable standard L with the pivotedfriction-rolls z i and beam B, substantially as and for the purpose setforth.

GEORGE P. ROSE. ABEL OARTWBIGHT. BENONI s. EosE.

Witnesses:

J. G. PERRY, H. T. BRAMAN, M. F. PERRY.

